build method

@override Widget build(BuildContext context)

Describes the part of the user interface represented by this widget.

The framework calls this method when this widget is inserted into the tree in a given BuildContext and when the dependencies of this widget change (e.g., an InheritedWidget referenced by this widget changes). This method can potentially be called in every frame and should not have any side effects beyond building a widget.

The framework replaces the subtree below this widget with the widget returned by this method, either by updating the existing subtree or by removing the subtree and inflating a new subtree, depending on whether the widget returned by this method can update the root of the existing subtree, as determined by calling Widget.canUpdate.

Typically implementations return a newly created constellation of widgets that are configured with information from this widget's constructor and from the given BuildContext.

The given BuildContext contains information about the location in the tree at which this widget is being built. For example, the context provides the set of inherited widgets for this location in the tree. A given widget might be built with multiple different BuildContext arguments over time if the widget is moved around the tree or if the widget is inserted into the tree in multiple places at once.

The implementation of this method must only depend on:

• the fields of the widget, which themselves must not change over time, and
• any ambient state obtained from the context using BuildContext.dependOnInheritedWidgetOfExactType.

If a widget's build method is to depend on anything else, use a StatefulWidget instead.

See also:

• StatelessWidget, which contains the discussion on performance considerations.

Implementation

@override
widgets.Widget build(widgets.BuildContext context) => SvgPicture.string(
      '''
<svg width="48" height="48" viewBox="0 0 48 48" fill="none" xmlns="http://www.w3.org/2000/svg">
<path d="M31 9V25.7311C31 26.7176 32.277 27.1082 32.8288 26.2906L35.5532 22.2546C36.3491 21.0754 37.9556 20.7747 39.1241 21.5862C40.1921 22.3278 40.5317 23.7539 39.9127 24.8973L32.975 37.7128C30.8779 41.5866 26.8271 44 22.4221 44H21C14.3726 44 9 38.6274 9 32V15C9 13.8954 9.89543 13 11 13C12.1046 13 13 13.8954 13 15V25.1111H15V9C15 7.89543 15.8954 7 17 7C18.1046 7 19 7.89543 19 9V23H21V6C21 4.89543 21.8954 4 23 4C24.1046 4 25 4.89543 25 6V23H27V9C27 7.89543 27.8954 7 29 7C30.1046 7 31 7.89543 31 9Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );